This is the 569th most frequent Serbian word.
школске
"School" or "school-related."
The word 'школске' is used as an adjective in plural form to describe 'bags' (торбе), meaning 'related to school'.
Школске торбе су теже него пре.
School bags are heavier than before.
In this sentence, 'школске' is used to qualify 'year' (године), indicating the period related to school activities.
За време школске године учимо разне предмете.
During the school year, we study various subjects.
The word 'школске' describes 'duties' (обавезе) in their relation to schoolwork or school-related responsibilities.